104 The Shell-Collector’s Handbook. 
three-fourths of a circle; outer lip somewhat oblique; 
umbilicus narrow, deep. Diameter 3,ths inch; length 
half-breadth. Animal bluish-black, with thick tentacles. 
Habitat.—Marshes, and banks of streams, ditches, &c. 
v. albinos (Moq.): Shell whitish, unicolour. 
ZONITES EXCAVATUS, BEAN. 
SHELL depressed, thin, sub-orbicular, shining, darkish 
horn-coloured ; strize well-defined ; whorls five and a half, 
convex ; spire slightly produced ; aperture small, lunate ; 
umbilicus large, deep, disclosing all the whorls. Diam. - 
maj. 64, min. 58, alt. 22 mill. Animal lead-coloured, with 
the mantle closely spotted with milk-white. 
Habitat.—W oods, among moss and dead leaves. 
v. vitrina (Fér.): Shell greenish-white, transparent. 
(=Helkx vitrina, Fér, Tabl. Syst. p. 45 —H. vir fae 
Menke. Syn. Moll., p. 20). 
ZONITES CRYSTALLINUS, MULLER. 
SHELL nearly flat, vitreous, diaphanous, glabrous, 
shining; whorls four and a half to five, the body- 
whorl being scarcely smaller than the preceding whorl; 
sutures well-defined, shallow ; aperture lunate ; umbilicus 
small. Diam. maj. 4, min. 33, alt. 13 mill. Animal milk- 
white with inky-black dorsal, and greyish ventral ten- 
tacles. 
Habitat—Woods and hedgerows, among moss and de- 
caying leaves. 
v.complanata (Jeff.): Shell nearly flat on both sides, 
the last whorl proportionately larger than the others. 
(B.C volt l.; p: 170). 
